| Abbreviation | Definition |
|---|---|
| OOMM | Organizational Operations and Maintenance Manual |
| OOP | Out Of Position |
| OOPS | Out Of Plane Spectrometer |
| OOS | On-Orbit Station |
| OOS | Orbit-to-Orbit Shuttle |
| OOS | Orbit-to-Orbit Stage |
| OOSDP | On-Orbit Station Distribution Panel |
| OOT | Out Of Tolerance |
| OP | OPen |
| OP | OPerate |
| OP | OPeration |
| OP | Oxygen Purge |
| OPA | Operations Planning Analysis |
| OPAL | Orbiting Picosatellite Automated Launcher |
| OPB | Oxidizer Pre-Burner |
| OPBOV | Oxidizer Preburner Oxidizer Valve |
| OPBOV | Oxidizer Pre-Burner Oxidizer Valve |
| OPDAR | Optical Detection and Ranging |
| OPE | Other Project Element |
| OPER | Operation |